Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67138b073d62e2f…

MALICIOUS

PDF

71.1 KB Created: 2021-09-25 19:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 265884c73c7a3891f3ffa5a2dab64ccc SHA-1: 072a00390e96ccaeff0dc500d2abbed90f32d9ee SHA-256: a67138b073d62e2ff5b61c2a1dac9761ed6c9d72d2dfabe25fd02d80fc9cd2b1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the PDF_RANDOM_URL_LINK heuristic further support the conclusion that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://avstralianature.ru/ckfinder/userfiles/files/jijodujibumipafaxisekuw.pdf In PDF document text
    • http://deshdunya.com/blogimage/file/gatelarogibe.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/74584097745.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/28523953000.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/zefiluxagefajunazixogisi.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/r00m2m3bqr9h03fg284t7vhtsk/luzizulalikavokurusaja.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/vudanepedifef.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/7148355252.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/gazigefajareruwoko.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/gesuloturugizezunikosoj.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109191303167171.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/fiwifeladipebe.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae0ae3e1d64282c298d2839efd5bfc73/degixikiwusililewosenewe.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/besug.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/vlggc4m8jh8pg1aqn81qga77nh/22680622261.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/ruvejitenopetapujudowul.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/31762074522.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/60175138372.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///9601790309.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/bonepumuvavulowololes.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/40654283667.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/86578910594.pdfIn PDF document text
    • http://sinners-party.de/media/file/ronakisarobuv.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/45494326705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=screen+mirror+without+chromecastPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EB 16340 bytes
SHA-256: c39cc6c1ab22d34e6873114aaaa13bf88ba8a7523a5ba33c6e474a28077f8bdd
font_01_sfnt_off0000ddb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CD 10712 bytes
SHA-256: e112db36a5521d2f6be24c0371ce2b7f48f304b30fd97b635990596b2466326d

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